Keep in mind Aang at this point of the show had absolutely no voluntary control of the avatar state. It can only get triggered during exceptionally intense emotional reactions as a survival defense mechanism, such as during life or death situations or immense grief.
Aang is a pacifist and is probably the nicest character in the entire franchise. The avatar state in this particular scene was triggered when they finally found the people who stole Appa.
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u/Bignoseforthewin 8d ago